What is a quark?

Hadrons are made up from quarks.

Which combination of quarks could make up a meson?

(a) $\mathrm{dd}\overline{\mathrm{s}}$

(b) $\mathrm{ssc}$

(c) $\mathrm{s}\overline{\mathrm{b}}$

(d) $\mathrm{sc}$

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

The given reaction violates one or more conservation laws. Identify the law that is violated.

$e^{+}\to {\mu }^{+}+{\overline{v}}_{\mu }+\overline{v_e}$

The electron and the neutron belong to different groups of particles.

Copy and complete the table to show the group of particles to which the electron and neutron belong and state the name of another member of each group.

What are the differences between a proton, a positron and a photon? You can describe how their masses differ, how their charges differ or whether they are

particles or antiparticles.

In a copy of the table shown below, write 'yes' to identify the interaction(s) that apply to hadrons and to leptons.